Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already flag destructiveHint=true and readOnlyHint=false, and the description is consistent with them: sending G-code is a mutating, potentially harmful action. It adds no further behavioral details such as immediate execution, command ordering, buffering, or error behavior, but the annotations lower the burden enough that this is minimally acceptable rather than contradicted.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

At six words, the description is highly compact and front-loaded, with no filler or repetition. It is a legitimate statement of the operation rather than a tautology.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description plus the fully described schema gives an agent enough to construct a call: printer_id plus one of gcode, macro, or snippet_id. However, for a raw hardware command with no output schema, it does not explain execution results, safety caveats, or how this differs from high-level sibling commands, so completeness is only at the minimum viable level.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%; every parameter has an explicit description and constraints, including gcode array limits, the macro enum, and printer_id minimum. The one-line description adds no parameter semantics, so the baseline 3 is appropriate for a schema-backed definition.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

Uses a specific verb ('Send') and resource ('G-code commands to a printer'), so an agent can tell this is a raw low-level command channel rather than high-level operations like move_printer_axis or set_printer_temperatures. It doesn't explicitly call out sibling relationships or the macro/snippet alternatives, so it falls short of a fully differentiating definition.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No when-to-use guidance appears; the description does not state when to prefer raw G-code over high-level printer controls, nor mention that gcode, macro, and snippet_id are mutually exclusive invocation paths. The tool's name and schema imply usage, but the description itself leaves selection logic entirely to the agent.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.